http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
해양 플랜트용 Hydrant Reducing Valve의 화재 안전시험에 대한 해석 기법 연구
정윤상(Yun Sang Jeong),강정호(Jung Ho Kang) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.6
해양플랜트는 고립된 한경 특성상 화재에 취약하다. 특히 해양플랜트의 주요 기자재인 소화용 감압 밸브가 피해를 입었을 때 해양플랜트의 피해는 증가한다. 본 논문에서는 해양플랜트에 사용되는 소화용 감압밸브에 대한 화재 안전시험을 수행하고 그 결과를 수치해석 결과와 비교, 분석하여 해석의 타당성을 증명하고 화재 안전시험에 대한 해석 기법을 제시하였다. 화재 안전시험의 화염을 구현하기 위해 FSI 를 이용하였으며 화재 안전시험의 온도 분포와 해석 결과 온도분포의 비교를 통해 해석 기법의 신뢰성을 확인하였다. 또한, 화재 안전시험에서 나타난 문제점을 구조해석을 통해 검증하였으며 그 결과 시트의 변형이 문제점으로 나타났다. An offshore plant is vulnerable to fire because of the isolated environment. In particular, the damage to an offshore plant is increased when a hydrant reducing valve, which is a main piece of equipment in an offshore plant, is damaged in a fire. In this study, we conducted a fire safety test for a hydrant reducing valve and proved the validity of our analysis by comparing the results of the test and analysis. Therefore, we here suggest an analysis method for a fire safety test. FSI(fluid structure interaction) was considered in the fire safety test. The reliability of the analysis method was verified by comparing the temperature distributions of the test and analysis. In addition, we verified the problems that were caused in the fire safety test by conducting a structure analysis. At a result, the main problem was found to be deformation of the valve seat.
디스크 방식 체크 밸브의 스프링력을 고려한 CFD 해석 기법 연구
정윤상(Yun-Sang Jeong),조준영(Jun-Young Cho),김성근(Sung-Kun Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In general, check valves are intended to prevent reverse flow and various types of check valves have been developed and are used in various industrial fields. One of them, the disk type check valve is equipped with a spring operating in the opposite direction to the fluid flow at the bottom of the valve disk to close the valve with spring force to prevent fluid from flowing in. Although the structure is simple and suitable for miniaturization, differential pressure and flow loss occur due to spring force in a normal flow state. This paper presents the method of CFD analysis that can consider the flow loss caused by spring force when performing CFD analysis to predict the performance of a disk type check valve. In order to verify the validity of the proposed method of CFD analysis, a flow test was performed and compared with the test and CFD analysis results.
디스크 방식 체크 밸브의 스프링력을 고려한 CFD 해석 기법 연구
정윤상(Yun-Sang Jeong),조준영(Jun-Young Cho),김성근(Sung-Kun Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In general, check valves are intended to prevent reverse flow and various types of check valves have been developed and are used in various industrial fields. One of them, the disk type check valve is equipped with a spring operating in the opposite direction to the fluid flow at the bottom of the valve disk to close the valve with spring force to prevent fluid from flowing in. Although the structure is simple and suitable for miniaturization, differential pressure and flow loss occur due to spring force in a normal flow state. This paper presents the method of CFD analysis that can consider the flow loss caused by spring force when performing CFD analysis to predict the performance of a disk type check valve. In order to verify the validity of the proposed method of CFD analysis, a flow test was performed and compared with the test and CFD analysis results.
엑시머 레이저를 이용한 파이렉스 유리의 미세 구멍 가공
이철재(Chul-Jae Lee),김하나(Ha-Na Kim),정윤상(Yun-Sang Jeong),전찬봉(Chan-Bong Jun),박영철(Young-Chul Park),강정호(Jung-Ho Kang) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.5
Presently, A glass is widely used in telecommunication system, optoelectronic devices and micro electro mechanical systems. Micro drilling of glass using the laser can save processing cost and improve the accuracy. This paper experiments micro drilling using KrF excimer laser on the pyrex glass of 500㎛ thickness. We have experiment to find out optimum laser machining conditions of micro drilling of glass and ablation depth and influence by processing parameter suc`h pulse repetition rate, energy density and number of pulses. Pulse repetition rate don"t influence ablation depth at the micro drilling of pyrex glass. Energy density influence micro drilling of parallelism and maximum thickness that can be drilled. Ablation depth is most influenced by number of pulses.